Discovery of a Gamma-Ray Black Widow Pulsar by GPU-accelerated Einstein@Home

  title={Discovery of a Gamma-Ray Black Widow Pulsar by GPU-accelerated Einstein@Home},
  author={Lars Nieder and Colin J. Clark and D. Kandel and Roger W. Romani and C. G. Bassa and Bruce Allen and A. Ashok and Ismael Cognard and Henning Fehrmann and Paulo C. C. Freire and Ramesh Karuppusamy and Michael Kramer and D. Z. Li and Bernd Machenschalk and Zhi-chen Pan and Maria Alessandra Papa and Scott M. Ransom and Paul S. Ray and Jayashree Roy and P. Wang and J. H. K. Wu and Carsten Aulbert and Ewan D. Barr and B. Beheshtipour and O. Behnke and Bhaswati Bhattacharyya and Rene P. Breton and Fernando Camilo and Claude Choquet and Vik S. Dhillon and Elizabeth C. Ferrara and Lucas Guillemot and Jason W. T. Hessels and Matthew Kerr and S. Kwang and Thomas R. Marsh and M. B. Mickaliger and Ziggy Pleunis and H. J. Pletsch and Mallory S. E. Roberts and S. Sanpa-arsa and B. Steltner},
  journal={The Astrophysical Journal},
We report the discovery of 1.97 ms period gamma-ray pulsations from the 75 minute orbital-period binary pulsar now named PSR J1653-0158. The associated Fermi Large Area Telescope gamma-ray source 4FGL J1653.6-0158 has long been expected to harbor a binary millisecond pulsar. Despite the pulsar-like gamma-ray spectrum and candidate optical/X-ray associations -- whose periodic brightness modulations suggested an orbit -- no radio pulsations had been found in many searches. The pulsar was… 

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